Model 8 (covariance outlier):
\(\mathbf {\epsilon }_i(t)\)  are generated from a stationary isotropic cross-covariance model belonging to the Matérn family ([1]} [1]}) with different smoothness parameters \(\nu _{ij} > 0\) :
\(C_{ii}(s,t)=\sigma ^2_i \mathcal {M}(|s-t|;\nu _{ii}),~~~i=1,2,3,~\\C_{ij}(s,t)=\rho _{ij}\sigma _i\sigma _j \mathcal {M}(|s-t|;\nu _{ij})~~~1\le i \ne j\le 3,\) 
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